<s>
Landsat	O
7	O
is	O
the	O
seventh	O
satellite	B-Application
of	O
the	O
Landsat	O
program	O
.	O
</s>
<s>
Launched	O
on	O
15	O
April	O
1999	O
,	O
Landsat	O
7	O
's	O
primary	O
goal	O
is	O
to	O
refresh	O
the	O
global	O
archive	O
of	O
satellite	B-Application
photos	O
,	O
providing	O
up-to-date	O
and	O
cloud-free	O
images	O
.	O
</s>
<s>
The	O
NASA	B-Language
WorldWind	I-Language
project	O
allows	O
3D	O
images	O
from	O
Landsat	O
7	O
and	O
other	O
sources	O
to	O
be	O
freely	O
navigated	O
and	O
viewed	O
from	O
any	O
angle	O
.	O
</s>
<s>
The	O
satellite	B-Application
's	O
companion	O
,	O
Earth	O
Observing-1	O
,	O
trailed	O
by	O
one	O
minute	O
and	O
followed	O
the	O
same	O
orbital	O
characteristics	O
,	O
but	O
in	O
2011	O
its	O
fuel	O
was	O
depleted	O
and	O
EO-1	O
'	O
s	O
orbit	O
began	O
to	O
degrade	O
.	O
</s>
<s>
In	O
2016	O
,	O
NASA	O
announced	O
plans	O
to	O
attempt	O
the	O
first	O
ever	O
refueling	O
of	O
a	O
live	O
satellite	B-Application
by	O
refueling	O
Landsat	O
7	O
in	O
2020	O
with	O
the	O
OSAM-1	O
mission	O
;	O
as	O
of	O
2021	O
,	O
the	O
launch	O
date	O
has	O
slipped	O
to	O
2025	O
.	O
</s>
<s>
NASA	O
decommissioned	O
the	O
satellite	B-Application
following	O
the	O
2021	O
launch	O
and	O
activation	O
of	O
Landsat	O
9	O
.	O
</s>
<s>
The	O
satellite	B-Application
weighs	O
1973kg	O
,	O
is	O
4.04	O
m	O
long	O
,	O
and	O
2.74	O
m	O
in	O
diameter	O
.	O
</s>
<s>
Unlike	O
its	O
predecessors	O
,	O
Landsat	O
7	O
has	O
a	O
solid-state	B-Device
memory	I-Device
of	O
378	O
Gbits	O
(	O
roughly	O
100	O
images	O
)	O
.	O
</s>
<s>
The	O
main	O
instrument	O
on	O
board	O
Landsat	O
7	O
is	O
the	O
Enhanced	B-Algorithm
Thematic	I-Algorithm
Mapper	I-Algorithm
Plus	I-Algorithm
(	O
ETM+	O
)	O
,	O
a	O
whisk	B-Algorithm
broom	I-Algorithm
scanner	I-Algorithm
image	B-Algorithm
sensor	I-Algorithm
.	O
</s>
<s>
In	O
August	O
1998	O
,	O
NASA	O
contracted	O
EarthSat	O
to	O
produce	O
Landsat	O
GeoCover	O
(	O
Geocover	O
2000	O
in	O
NASA	B-Language
WorldWind	I-Language
)	O
—	O
a	O
positionally	O
accurate	O
orthorectified	O
Landsat	O
Thematic	O
Mapper	O
and	O
Multispectral	O
Scanner	O
imagery	O
covering	O
the	O
majority	O
of	O
the	O
Earth	O
's	O
land	O
mass	O
.	O
</s>
<s>
Other	O
commercial	O
simulated	O
true	O
color	O
15-metre	O
global	O
imagery	O
products	O
built	O
from	O
the	O
NASA	O
Landsat	O
7	O
imagery	O
include	O
TerraColor	O
from	O
Earthstar	O
Geographics	O
,	O
TruEarth	O
(	O
found	O
in	O
Google	B-Application
Earth	I-Application
and	O
Google	B-Application
Maps	I-Application
)	O
from	O
TerraMetrics	O
,	O
BrightEarth	O
from	O
ComputaMaps	O
,	O
simulated	O
natural	O
color	O
from	O
Atlogis	O
and	O
a	O
product	O
of	O
i-cubed	O
used	O
in	O
NASA	B-Language
WorldWind	I-Language
.	O
</s>
<s>
Large	O
parts	O
of	O
the	O
Earth	O
surface	O
displayed	O
on	O
web	O
mapping	O
services	O
like	O
Google	B-Application
Maps	I-Application
/	O
Google	B-Application
Earth	I-Application
,	O
MSN	B-Application
Maps	I-Application
or	O
Yahoo	O
!	O
</s>
<s>
From	O
that	O
point	O
forward	O
,	O
the	O
satellite	B-Application
's	O
orbit	O
began	O
to	O
slowly	O
degrade	O
(	O
lower	O
)	O
such	O
that	O
by	O
2021	O
it	O
had	O
faded	O
from	O
the	O
desired	O
10:00	O
AM	O
LMT	O
to	O
about	O
9:15	O
AM	O
.	O
</s>
<s>
Its	O
orbit	O
has	O
degraded	O
such	O
that	O
Landsat	O
9	O
can	O
move	O
into	O
the	O
705-km	O
)	O
"	O
standard	O
"	O
orbit	O
altitude	O
,	O
and	O
take	O
Landsat	O
7	O
's	O
place	O
in	O
an	O
orbit	O
that	O
allows	O
data	O
to	O
be	O
collected	O
eight	O
days	O
out	O
of	O
phase	O
with	O
Landsat	O
8	O
(	O
with	O
two	O
satellites	B-Application
in	O
orbit	O
,	O
a	O
Landsat	O
scene	O
is	O
collected	O
over	O
every	O
location	O
on	O
Earth	O
every	O
eight	O
days	O
)	O
.	O
</s>
<s>
On	O
April	O
6	O
,	O
2022	O
,	O
the	O
science	O
mission	O
was	O
suspended	O
and	O
the	O
image	B-Algorithm
sensor	I-Algorithm
was	O
placed	O
into	O
standby	O
mode	O
as	O
the	O
satellite	B-Application
's	O
orbit	O
was	O
lowered	O
.	O
</s>
<s>
NASA	O
is	O
exploring	O
the	O
possibility	O
of	O
using	O
NASA	O
's	O
Restore-L	O
Robotic	O
Servicing	O
Mission	O
27	O
to	O
refuel	O
Landsat	O
7	O
,	O
primarily	O
to	O
ensure	O
successful	O
decommissioning	O
,	O
but	O
also	O
to	O
provide	O
the	O
possibility	O
of	O
turning	O
the	O
satellite	B-Application
into	O
a	O
transfer	O
radiometer	O
.	O
</s>
